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ILS Ch 14

QuestionAnswer
Work apply force times distance, labeled in Joules
Power labeled in watts or horsepower, work divided by time, rate of doing work
Machine multiplies force, force and distance are inverse, can change direction of force
Work output can not be greater than work input, increased by reducing friction or increasing work input
Mechanical advantage output force divided by input force
IMA problem, pulley
Friction decreases efficiency
Efficiency never 100%, always less, some input force always lost to friction, work output divided by work input
Inclined plane increases distance, ramp
Wedge 2 inclined planes, axe, as thickness increases IMA decreases
Wheel and axle doorknob
Compound machine includes more than one simple machine, bicycle
Force only does work if it applied in the direction of the motion
Screw inclined plane wrapped around a cylinder
Levers 3 classes, gears are continuous levers
First class lever fulcrum in middle
Second class lever output force in middle
Third class lever input force in middle, IMA always less than 1
Math problems work, power, efficiency,
Created by: evroman
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